path: root/net/bridge/br_netlink.c

/*
 *	Bridge netlink control interface
 *
 *	Authors:
 *	Stephen Hemminger		<shemminger@osdl.org>
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/etherdevice.h>
#include <net/rtnetlink.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <uapi/linux/if_bridge.h>

#include "br_private.h"
#include "br_private_stp.h"
#include "br_private_tunnel.h"

static int __get_num_vlan_infos(struct net_bridge_vlan_group *vg,
				u32 filter_mask)
{
	struct net_bridge_vlan *v;
	u16 vid_range_start = 0, vid_range_end = 0, vid_range_flags = 0;
	u16 flags, pvid;
	int num_vlans = 0;

	if (!(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
		return 0;

	pvid = br_get_pvid(vg);
	/* Count number of vlan infos */
	list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
		flags = 0;
		/* only a context, bridge vlan not activated */
		if (!br_vlan_should_use(v))
			continue;
		if (v->vid == pvid)
			flags |= BRIDGE_VLAN_INFO_PVID;

		if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
			flags |= BRIDGE_VLAN_INFO_UNTAGGED;

		if (vid_range_start == 0) {
			goto initvars;
		} else if ((v->vid - vid_range_end) == 1 &&
			flags == vid_range_flags) {
			vid_range_end = v->vid;
			continue;
		} else {
			if ((vid_range_end - vid_range_start) > 0)
				num_vlans += 2;
			else
				num_vlans += 1;
		}
initvars:
		vid_range_start = v->vid;
		vid_range_end = v->vid;
		vid_range_flags = flags;
	}

	if (vid_range_start != 0) {
		if ((vid_range_end - vid_range_start) > 0)
			num_vlans += 2;
		else
			num_vlans += 1;
	}

	return num_vlans;
}

static int br_get_num_vlan_infos(struct net_bridge_vlan_group *vg,
				 u32 filter_mask)
{
	int num_vlans;

	if (!vg)
		return 0;

	if (filter_mask & RTEXT_FILTER_BRVLAN)
		return vg->num_vlans;

	rcu_read_lock();
	num_vlans = __get_num_vlan_infos(vg, filter_mask);
	rcu_read_unlock();

	return num_vlans;
}

static size_t br_get_link_af_size_filtered(const struct net_device *dev,
					   u32 filter_mask)
{
	struct net_bridge_vlan_group *vg = NULL;
	struct net_bridge_port *p = NULL;
	struct net_bridge *br;
	int num_vlan_infos;
	size_t vinfo_sz = 0;

	rcu_read_lock();
	if (br_port_exists(dev)) {
		p = br_port_get_rcu(dev);
		vg = nbp_vlan_group_rcu(p);
	} else if (dev->priv_flags & IFF_EBRIDGE) {
		br = netdev_priv(dev);
		vg = br_vlan_group_rcu(br);
	}
	num_vlan_infos = br_get_num_vlan_infos(vg, filter_mask);
	rcu_read_unlock();

	if (p && (p->flags & BR_VLAN_TUNNEL))
		vinfo_sz += br_get_vlan_tunnel_info_size(vg);

	/* Each VLAN is returned in bridge_vlan_info along with flags */
	vinfo_sz += num_vlan_infos * nla_total_size(sizeof(struct bridge_vlan_info));

	return vinfo_sz;
}

static inline size_t br_port_info_size(void)
{
	return nla_total_size(1)	/* IFLA_BRPORT_STATE  */
		+ nla_total_size(2)	/* IFLA_BRPORT_PRIORITY */
		+ nla_total_size(4)	/* IFLA_BRPORT_COST */
		+ nla_total_size(1)	/* IFLA_BRPORT_MODE */
		+ nla_total_size(1)	/* IFLA_BRPORT_GUARD */
		+ nla_total_size(1)	/* IFLA_BRPORT_PROTECT */
		+ nla_total_size(1)	/* IFLA_BRPORT_FAST_LEAVE */
		+ nla_total_size(1)	/* IFLA_BRPORT_MCAST_TO_UCAST */
		+ nla_total_size(1)	/* IFLA_BRPORT_LEARNING */
		+ nla_total_size(1)	/* IFLA_BRPORT_UNICAST_FLOOD */
		+ nla_total_size(1)	/* IFLA_BRPORT_MCAST_FLOOD */
		+ nla_total_size(1)	/* IFLA_BRPORT_BCAST_FLOOD */
		+ nla_total_size(1)	/* IFLA_BRPORT_PROXYARP */
		+ nla_total_size(1)	/* IFLA_BRPORT_PROXYARP_WIFI */
		+ nla_total_size(1)	/* IFLA_BRPORT_VLAN_TUNNEL */
		+ nla_total_size(1)	/* IFLA_BRPORT_NEIGH_SUPPRESS */
		+ nla_total_size(sizeof(struct ifla_bridge_id))	/* IFLA_BRPORT_ROOT_ID */
		+ nla_total_size(sizeof(struct ifla_bridge_id))	/* IFLA_BRPORT_BRIDGE_ID */
		+ nla_total_size(sizeof(u16))	/* IFLA_BRPORT_DESIGNATED_PORT */
		+ nla_total_size(sizeof(u16))	/* IFLA_BRPORT_DESIGNATED_COST */
		+ nla_total_size(sizeof(u16))	/* IFLA_BRPORT_ID */
		+ nla_total_size(sizeof(u16))	/* IFLA_BRPORT_NO */
		+ nla_total_size(sizeof(u8))	/* IFLA_BRPORT_TOPOLOGY_CHANGE_ACK */
		+ nla_total_size(sizeof(u8))	/* IFLA_BRPORT_CONFIG_PENDING */
		+ nla_total_size_64bit(sizeof(u64)) /* IFLA_BRPORT_MESSAGE_AGE_TIMER */
		+ nla_total_size_64bit(sizeof(u64)) /* IFLA_BRPORT